NEW YORK (TheStreet) -- RATINGS CHANGES

Assurant(AIZ) - Get Report was upgraded to buy from underperform by Bank of America/Merrill Lynch, which set a $89 price target, saying the company is attractively valued and has multiple potential catalysts.

Bunge(BG) - Get Report was downgraded to hold by TheStreet Ratings. You can view the full analysis from the report here: BG Ratings Report.

Coach (COH) was downgraded to neutral by JP Morgan, which set a $30 price target, saying industry growth is decelerating.

ImmunoGen(IMGN) - Get Report was downgraded to hold from buy by Cantor Fitzgerald, which set a $21 price target, pointing to a narrowing valuation gap.

Plexus(PLXS) - Get Report was upgraded to buy from neutral by Goldman Sachs, which set a $44 price target, saying the company can expand margins.

Realogy(RLGY) - Get Report was downgraded to neutral from buy by Goldman Sachs, which also cut the company from its conviction list and set a $47 price target, saying Realogy has not been able to leverage higher home sales.

Sanmina(SANM) - Get Report was downgraded to neutral by Goldman Sachs, which cited valuation, based on a $23 price target.

Superior Energy Services (SPN) was downgraded to sell by TheStreet Ratings. You can view the full analysis from the report here: SPN Ratings Report.

Torchmark (TMK) was upgraded to market perform from underperform by FBR Capital Markets, which said that Torchmark's American income segment has turned around and the company can post solid growth across the board.

Ulta Salon(ULTA) - Get Report was started at hold by Deutsche Bank, which cited valuation, based on a $162 price target.

Whiting Petroleum(WLL) - Get Report was upgraded to buy from hold by Canaccord Genuity, which set a $38 price target, saying the stock offers a compelling value, given its assets in the Williston Basin.

Westrock(WRK) - Get Report was upgraded to outperform from market perform by Wells Fargo. Estimates have also been increased, given higher expected coated recycled board prices, Wells Fargo said.